You do not notice this with flying your ship / shooting bullets, as that kind of collision is client sided and the hitbox only remains on the server.
Missile collsion however is on the server, and as such the "dead" asteroid can absorb for example ab missiles without the base taking damage.
Best way to reproduce:
start as dreg with ff on
build a tp con
research bombers
place tp on a decent sized rock (the larger the better, but tps in general should be small enough even on small rocks)
rip bbr to tp/ fly to 900m range
fire ab missiles from 900m and watch them die before they hit the tp, without doing dmg.
Same problem exists with all bases, however with the larger bases its harder to notice as they are mostly larger than small-medium sized rocks.
This bug was originally found during testing of draconium base hitboxes and obviously nearly drove us crazy

I have confirmed it also exists on public beta just to be save.